Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"con cac cua snippets" » "chon cac cua snippets", "cong cac cua snippets", "co cac cua snippets", "con cach cua snippets", "con cac qua snippets", "con ca cua snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung java java snippets") or ("con cac cua snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("con cac cua snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( con cac cua snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("con cac cua snippets"))) or ("locating bug code snippets"))*.